Fabian Homborg 789b2010f5 Don't use a function variable in alias
This conditionally set a function variable in an unsafe way.

If you do something like

```fish
if condition
   set -f foo bar
end
```

then, if the condition was false, $foo could still use a global variable.

In this case, alias would now fail if a variable $wraps was defined globally.

This reverts most of commit 14458682d9e86c969284fbc77d1fbf36ca4a82b8.

The message rewording can stay, it's *fine* (tho it'll break the
translations but then we'd need a real string freeze with a
translation team for those to be worth anything anyway, soo)
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